【摘 要】
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Dear editor,rnDiesel engines have been widely used in vehicles because of their excellent fuel efficiency and durability.Although they only represent a small percentage of vehicle ownership,they cause the majority of on-road emissions such as NOx and PM[1
【机 构】
：
State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130025,China;De
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Dear editor,rnDiesel engines have been widely used in vehicles because of their excellent fuel efficiency and durability.Although they only represent a small percentage of vehicle ownership,they cause the majority of on-road emissions such as NOx and PM[1].By analyzing the emission characteristics of diesel engines,transient engine operation such as at idle speed and start-up is found to cause substantially more to total emissions over a driving cycle compared to steady-state en-gine operation[2].Therefore,the challenge of the existing technology is to improve the emission and fuel consumption performance of diesel engine under transient conditions.
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